Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 150.9	$ 288.6
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	127.0	106.1
Depreciation, amortization, and accretion	110.9	112.1
Other	1.5	(1.8)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	147.5	304.8
Prepaid expenses and other assets	(26.5)	46.4
Accounts payable	(28.8)	(5.1)
Accrued compensation	15.8	(20.6)
Income taxes payable	(77.7)	27.9
Other accrued liabilities	(27.5)	(32.4)
Deferred revenue	48.3	19.3
Net cash provided by operating activities	441.4	845.3
Cash flows from investing activities:
Purchases of property and equipment	(79.3)	(64.3)
Purchases of available-for-sale debt investments	(114.4)	(776.4)
Proceeds from sales of available-for-sale debt investments	995.4	429.1
Proceeds from maturities and redemptions of available-for-sale debt investments	289.9	350.4
Purchases of equity investments	(6.3)	(12.3)
Proceeds from sales of equity investments	29.5	0.0
Proceeds from Pulse note receivable	0.0	75.0
Payment of escrow balance related to prior year acquisitions	(31.5)	0.0
Net cash provided by investing activities	1,083.3	1.5
Cash flows from financing activities:
Repurchase and retirement of common stock, including prepayment under an accelerated share repurchase program	(754.2)	(255.3)
Proceeds from issuance of common stock	29.5	35.5
Payment of dividends	(124.9)	(75.8)
Change in customer financing arrangement	(16.3)	0.0
Other	(0.5)	0.0
Net cash used in financing activities	(866.4)	(295.6)
Effect of foreign currency exchange rates on cash, cash equivalents and restricted cash	(5.4)	9.4
Net increase in cash, cash equivalents and restricted cash	652.9	560.6
Cash, cash equivalents and restricted cash at beginning of period	2,059.1	1,880.6
Cash, cash equivalents and restricted cash at end of period	$ 2,712.0	$ 2,441.2

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration